* {
    margin: 0;
    padding: 0;
}


.el-footer {
    line-height: 60px;
    text-align: center;
    background-color: aliceblue;
}

.el-carousel__item h3 {
    color: #475669;
    font-size: 18px;
    opacity: 0.75;
    line-height: 300px;
    margin: 0;
}

.el-carousel__item:nth-child(2n) {
    background-color: #99a9bf;
}

.el-carousel__item:nth-child(2n+1) {
    background-color: #d3dce6;
}

.el-main {
    color: #333;
    background-image: url("../img/beijing.jpg");
    background-size: 100% 100%;
    height: 600px;
}

.right {
    width: 100px;
    text-align: center;
    float: right;
    margin: 0 30px;
}

.left {
    width: 100px;
    text-align: center;
    float: left;
    margin: 0 30px;
}

.box {
    width: 400px;
    height: 500px;
    margin: auto;
    overflow: hidden;
    position: absolute;
    top: 100px;
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    border-radius: 15px;
    z-index: 100;
}

.clearfix::after {
    content: '';
    display: text;
    clear: both;
}

.card {
    width: 100%;
    height: 65%;
    background-color: rgb(255, 255, 255);
    transform-style: preserve-3d;
    backface-visibility: hidden;
    position: absolute;
    top: 0;
    left: 0;
    transition: transform .8s ease-in-out;
    display: flex;
    /* justify-content: center; */
    align-items: center;
    border-radius: 15px;
    box-shadow: 1px 5px 13px 6px rgba(0, 0, 0, 0.307);
}

.res {
    height: 90%;
}

#front {
    transform: rotateY(0deg);
}

#back {
    transform: rotateY(180deg);
}

.but_swith {
    top: -45%;
    right: -1%;
}

.form {
    margin-left: -75px;
}
.close_swith{
    position: absolute;
    margin-top: -77%;
    left: 95%;
}
.close_swith{
    cursor: pointer;
}
#close{
    margin-top: -430px;
}